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C SI D VA ROG!!!! AM NEVOIE URGENT

C SI D VA ROG AM NEVOIE URGENT class=

Răspuns :

1.5+(-7)-(-4)-(-6)=
-2-(-4)-(-6)=
-2+4+6=
+2+6=8

2.-4+(-2)+3-(-5+7-9+1)=
+2+3-(+2-9+1)=
+5-(-7+1)=
+5-(-6)=
+5+6= 11

3.7-(-13+25+4)-(8+13-25)-(-5-3)=
7-(+11+4)-(8+13-25)-(-8)=
7-(+15)-(21-25)+8=
8-(-4)+8=
8+4+8=
12+8=20